ENTRY 21750 20131118 22382175000000001 SUBENT 21750001 20131118 22382175000100001 BIB 8 17 2175000100002 INSTITUTE (2UK ALD) Experimental site and both authors. 2175000100003 REFERENCE (J,JNE/AB,17,437,196312) 2175000100004 AUTHOR (M.H.McTaggart,H.Goodfellow) 2175000100005 TITLE Measurements at 14 MeV neutron energy of the 2175000100006 (n,2n) cross section of beryllium and the 2175000100007 (n,3n) cross section of thorium 2175000100008 FACILITY (ACCEL,2UK ALD) .Type not given. 2175000100009 INC-SOURCE (D-T) 200 keV deuteron beam focused onto a 2175000100010 tritiated zirconium target, producing 2175000100011 14 MeV neutrons. 2175000100012 PART-DET (N) Neutrons. 2175000100013 HISTORY (19820127C) A.P.T. 2175000100014 (19820217E) 2175000100015 (19860210E) 2175000100016 (20070314A) Date is corrected 2175000100017 (20131118A) SD: REACTION code was corrected in Sub.006.2175000100018 Minor corrections in all Subents. 2175000100019 ENDBIB 17 0 2175000100020 COMMON 1 3 2175000100021 EN 2175000100022 MEV 2175000100023 1.4E+01 2175000100024 ENDCOMMON 3 0 2175000100025 ENDSUBENT 24 0 2175000199999 SUBENT 21750002 20131118 22382175000200001 BIB 10 30 2175000200002 REACTION (4-BE-9(N,NON),,SIG) 2175000200003 SAMPLE .Four beryllium shells of thickness 2.032 cm, 2175000200004 2.91 cm, 3.31 cm and 5.34 cm. 2175000200005 METHOD .The neutron multiplication and the neutron 2175000200006 detector efficiency was measured. These values plus 2175000200007 the assumed eta value was used to calculate the 2175000200008 transmission which then was used to calculate the 2175000200009 total nonelastic cross section. 2175000200010 DETECTOR (LONGC) The neutron detector was a modified Hanson 2175000200011 McKibben 'long counter'. Its efficiency at 14 MeV and 2175000200012 at fission neutron energies was measured in each 2175000200013 experiment. 2175000200014 ASSUMED (ASSUM1,4-BE-9(N,A)2-HE-6,,SIG) For 14 MeV incident 2175000200015 neutrons. Taken from (,Vasil'ev+,J,JET,6,411,1958) 2175000200016 (ASSUM2,4-BE-9(N,T)3-LI-7,,SIG) For 14 MeV incident 2175000200017 neutrons. Taken from (11198.002,Benveniste+,R, 2175000200018 UCR-5596,1959). 2175000200019 (ASSUM3,4-BE-9(N,TOT),,SIG) Postulating a total cross 2175000200020 section for 14 MeV incident neutrons. 2175000200021 (ASSUM4,4-BE-9(N,NON),,ETA) - from ASSUM1-ASSUM3 2175000200022 REL-REF (R,,S.S.Vasil'ev+,J,JET,6,411,1958) - ASSUM1 2175000200023 (R,11193002,J.B.Benveniste+,R,UCRL-5596,1959) - ASSUM2 2175000200024 STATUS (TABLE) Tbl.1 from JNE/AB,17,437 2175000200025 CORRECTION .Difference between detector efficiency for 2175000200026 fast and slow neutrons. 2175000200027 MISC-COL (MISC) Shell thickness 2175000200028 ERR-ANALYS (DATA-ERR) Total error includes: 2175000200029 (ERR-1) error of 1.5% in multiplication measurement, 2175000200030 (ERR-2) 2.5% in detector efficiency measurement and 2175000200031 * errors in assumed cross section. 2175000200032 ENDBIB 30 0 2175000200033 COMMON 6 3 2175000200034 ASSUM1 ASSUM2 ASSUM3 ASSUM4 ERR-1 ERR-2 2175000200035 MB MB MB NO-DIM PER-CENT PER-CENT 2175000200036 1.E+01 1.E+01 5.E+02 1.96 1.5 2.5 2175000200037 ENDCOMMON 3 0 2175000200038 DATA 3 4 2175000200039 DATA DATA-ERR MISC 2175000200040 MB MB CM 2175000200041 5.2E+02 6.E+01 2.032 2175000200042 5.2E+02 5.E+01 2.91 2175000200043 5.4E+02 5.E+01 3.31 2175000200044 5.85E+02 6.E+01 5.34 2175000200045 ENDDATA 6 0 2175000200046 ENDSUBENT 45 0 2175000299999 SUBENT 21750003 20131118 22382175000300001 BIB 10 39 2175000300002 REACTION (4-BE-9(N,2N+A)2-HE-4,,SIG,,,DERIV) 2175000300003 SAMPLE .Four beryllium shells of thickness 2.032 cm, 2175000300004 2.91 cm, 3.31 cm and 5.34 cm. 2175000300005 METHOD .The neutron multiplication and the neutron detector 2175000300006 efficiency was measured. These values plus the 2175000300007 assumed eta value was used to calculate the 2175000300008 transmission which then was used to calculate 2175000300009 the (n,2n) cross section from the nonelastic. 2175000300010 .The cross section is given for sample thickness 2175000300011 zero (extrapolation). 2175000300012 DETECTOR (LONGC) The neutron detector was a modified Hanson 2175000300013 McKibben 'long counter'. Its efficiency at 14 MeV and 2175000300014 at fission neutron energies was measured in each 2175000300015 experiment. 2175000300016 ASSUMED (ASSUM1,4-BE-9(N,A)2-HE-6,,SIG) For 14 MeV incident 2175000300017 neutrons. Taken from (,Vasilev+,J,JET,6,411,1958) 2175000300018 (ASSUM2,4-BE-9(N,T)3-LI-7,,SIG) For 14 MeV incident 2175000300019 neutrons. Taken from (11198.002,Benveniste+,R, 2175000300020 UCR-5596,1959). 2175000300021 (ASSUM3,4-BE-9(N,TOT),,SIG) Postulating a total cross 2175000300022 section for 14 MeV incident neutrons. 2175000300023 (ASSUM4,4-BE-9(N,NON),,ETA) - from ASSUM1-ASSUM3 2175000300024 REL-REF (R,40712002,S.S.Vasil'ev+,J,JET,6,411,1958) - ASSUM1 2175000300025 (R,11193002,J.B.Benveniste+,R,UCRL-5596,1959) - ASSUM2 2175000300026 STATUS (TABLE) Value from the text on p.437 from JNE/AB,17 2175000300027 (DEP,21750002) The results for the total non-elastic 2175000300028 cross section show a tendency to increase with shell 2175000300029 thickness. A linear extrapolation to zero thickness 2175000300030 gave 470 +- 40 mb and an n,2n cross section of 2175000300031 450 +- 40 mb. 2175000300032 CORRECTION .Difference between detector efficiency for 2175000300033 fast and slow neutrons. 2175000300034 ERR-ANALYS (DATA-ERR) Total error includes: 2175000300035 (ERR-1) error of 1.5% in multiplication measurement, 2175000300036 (ERR-2) 2.5% in detector efficiency measurement and 2175000300037 * errors in assumed cross section. 2175000300038 HISTORY (20070314A) Reaction code corrected 2175000300039 (20131118A) SD: SF6=SIG -> ETA in ASSUM4. MISC col. 2175000300040 deleted. 2175000300041 ENDBIB 39 0 2175000300042 COMMON 6 3 2175000300043 ASSUM1 ASSUM2 ASSUM3 ASSUM4 ERR-1 ERR-2 2175000300044 MB MB MB NO-DIM PER-CENT PER-CENT 2175000300045 1.E+01 1.E+01 5.E+02 1.96 1.5 2.5 2175000300046 ENDCOMMON 3 0 2175000300047 DATA 2 1 2175000300048 DATA DATA-ERR 2175000300049 MB MB 2175000300050 4.5E+02 4.E+01 2175000300051 ENDDATA 3 0 2175000300052 ENDSUBENT 51 0 2175000399999 SUBENT 21750004 20131118 22382175000400001 BIB 7 21 2175000400002 REACTION (90-TH-232(N,NON),,SIG) 2175000400003 SAMPLE .Three thorium shells of thickness 2.54,2.54,and 2175000400004 5.08 cm. 2175000400005 METHOD (TRN) .The neutron multiplication, the detector 2175000400006 efficiency and the transmission were measured and the 2175000400007 non-elastic cross section were calculated form these 2175000400008 values and from the derived eta values. 2175000400009 .The average of the values obtained for the 2175000400010 three samples was computed. 2175000400011 DETECTOR (THRES) Cu-63(n,2n) threshold detector for the 2175000400012 transmission measurement. 2175000400013 (LONGC) The neutron detector was a modified Hanson 2175000400014 McKibben 'long counter'. Its efficiency at 14 MeV and 2175000400015 at fission neutron energies was measured in each 2175000400016 experiment. 2175000400017 STATUS (TABLE) Tbl.2 from JNE/AB,17,437 2175000400018 (DEP,21750006) 2175000400019 CORRECTION .Difference between detector efficiency for 2175000400020 for fast and slow neutrons. 2175000400021 ERR-ANALYS (DATA-ERR) .Counting statistics, errors in 2175000400022 detector efficiencies and errors in assumed values. 2175000400023 ENDBIB 21 0 2175000400024 NOCOMMON 0 0 2175000400025 DATA 2 1 2175000400026 DATA DATA-ERR 2175000400027 B B 2175000400028 2.77 9.E-02 2175000400029 ENDDATA 3 0 2175000400030 ENDSUBENT 29 0 2175000499999 SUBENT 21750005 20131118 22382175000500001 BIB 9 31 2175000500002 REACTION (90-TH-232(N,3N)90-TH-230,,SIG) 2175000500003 SAMPLE .Three thorium shells of thickness 2.54,2.54,and 2175000500004 5.08 cm. 2175000500005 ANALYSIS .Data were obtained using the derived eta values, 2175000500006 the calculated nonelastic cross sections and the 2175000500007 assumed values. 2175000500008 .The average of the values obtained for the 2175000500009 three samples was computed. 2175000500010 DETECTOR (THRES) Cu-63 (n,2n) threshold detector for the 2175000500011 transmission measurement. 2175000500012 (LONGC) The neutron detector was a modified Hanson 2175000500013 McKibben 'long counter'. Its efficiency at 14 MeV and 2175000500014 at fission neutron energies was measured in each 2175000500015 experiment. 2175000500016 ASSUMED (ASSUM1,90-TH-232(N,F),,NU) For 14 MeV incident 2175000500017 neutrons taken from (21696002,I.Johnstone+,R, 2175000500018 AERE-NP/R-1912,1955). 2175000500019 (ASSUM2,90-TH-232(N,F),,SIG) For 14 MeV incident 2175000500020 neutrons from Moat (priv.comm.) 2175000500021 (ASSUM3,90-TH-232(N,2N)90-TH-231,,SIG) For 14 MeV 2175000500022 neutrons taken from(21208002,J.L.Perkin+,J,JNE/AB, 2175000500023 14,69,1961). 2175000500024 REL-REF (R,21696002,I.Johnstone+,R,AERE-NP/R-1912,1955) 2175000500025 - ASSUM1 2175000500026 (R,21208002,J.L.Perkin+,J,JNE/AB,14,69,1961) - ASSSUM3 2175000500027 STATUS (TABLE) Tbl.2 from JNE/AB,17,437 2175000500028 (DEP,21750006) 2175000500029 CORRECTION .Difference between detector efficiency for 2175000500030 fast and slow neutrons. 2175000500031 ERR-ANALYS (DATA-ERR) .Counting statistics, errors in detector 2175000500032 efficiency and errors in assumed values. 2175000500033 ENDBIB 31 0 2175000500034 COMMON 6 3 2175000500035 ASSUM1 ASSUM1-ERR ASSUM2 ASSUM2-ERR ASSUM3 ASSUM3-ERR 2175000500036 NO-DIM NO-DIM B B B B 2175000500037 3.35 2.E-01 3.32E-01 1.4E-02 1.2 5.E-022175000500038 ENDCOMMON 3 0 2175000500039 DATA 2 1 2175000500040 DATA DATA-ERR 2175000500041 B B 2175000500042 8.5E-01 1.5E-01 2175000500043 ENDDATA 3 0 2175000500044 ENDSUBENT 43 0 2175000599999 SUBENT 21750006 20131118 22382175000600001 BIB 8 19 2175000600002 REACTION (90-TH-232(N,NON),,ETA) 2175000600003 SAMPLE .Three thorium shells of thickness 2.54,2.54,and 2175000600004 5.08 cm. 2175000600005 METHOD (TRN) .The eta value was derived from the measured 2175000600006 neutron multiplication, the measured detector 2175000600007 efficiency and the measured transmission. 2175000600008 .The average of the values obtained for the 2175000600009 three samples was computed. 2175000600010 DETECTOR (THRES) Cu-63(n,2n) threshold detector for the 2175000600011 transmission measurement. 2175000600012 (LONGC) Modified hanson mckibben long counter. 2175000600013 STATUS (TABLE) Tbl.2 from JNE/AB,17,437 2175000600014 CORRECTION .Difference between detector efficiency for 2175000600015 fast and slow neutrons. 2175000600016 ERR-ANALYS (DATA-ERR) .Counting statistics, errors in detector 2175000600017 efficiency and errors in assumed values. 2175000600018 HISTORY (19860121A) 'NON' changed to 'ABS' in reaction string 2175000600019 (20131118A) SD: REACTION code was corrected according 2175000600020 to Memo CP-D/798 (SF3=ABS => NON - general case). 2175000600021 ENDBIB 19 0 2175000600022 NOCOMMON 0 0 2175000600023 DATA 2 1 2175000600024 DATA DATA-ERR 2175000600025 PRT/REAC PRT/REAC 2175000600026 2.34 8.E-02 2175000600027 ENDDATA 3 0 2175000600028 ENDSUBENT 27 0 2175000699999 ENDENTRY 6 0 2175099999999